[rules-users] counting facts of a kind

[Swindells, Thomas]

You've probably configured your system to be using persistence?
In which case what you are persisting needs to be serializable so that it can be persisted

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 23 August 2010 12:17
To: Rules Users List
Subject: [rules-users] counting facts of a kind

As simple as it gets:

rule countHigh
when
    $n : Number() from accumulate ( $sgc : StartGoalConn() count( $sgc ) )
then
    System.out.println( "plain routes: " + $n );
end

And yet, it fails:

Exception in thread "main" org.drools.RuntimeDroolsException: java.lang.ClassCastException: rss.ixl.route.TrainStartGoalConn cannot be cast to java.io.Serializable

Sure, adding "implements Serializable" to StartGoalConn fixes this. But why is this necessary?

FYI, StartGoalConn is abstract superclass of TrainStartGoalConn - just in case this has some bearing on this issue.

Best
-W

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